Spool for photographic film cartridges



Sept. 25, i923.

' ASQMES E. F. KINGSBURY SPOOL FORPHOTOGRAPHIC FILM CARTRIDGES Original Filed Jan. 2l. 1921 12 20 @El 5- Hq@ ATTORN EYS.

Patented Sept. 25, 1923. l

11T STATES wat FFCE,

-E13-WIN E. hxrNesBURY, or RUTHERFORD, NEW JERSEY, AssIGNOR 'ro RAs'rmnN KODAK COMPANY, or ROCHESTER, Nnw YORK, A CORPORATION OE NEW YORK.

sroor. ROR rHOrOGRArHIC EILMCARTRIDGES;

Original application filed January 21, 1921, Serial No. 438,888. Divided and this application ied September 6, 1921.

To all wlwm t may concern.' Be it known that I, EDWIN F. KINGsBuRY,

aciti'zen 'of the United States of America,

residing' .at' Rutherford, in the county 'of Bergen and State of New Jersey, have 1nvented certain `new and useful Improvements in Spools for Photographic Film Cartridges, of which the ollowmg is a full, clear, and exact specification.

This application relates to a spool for a roll film cartridge of the ype commonly used in cameras, and is a ivision of my application, Serial No. 438,888, filed Jan. 21, 1921. In that application it was pointed 15 out that when strip material, includm photographically sensitized material 'an protective material, is wound upon a ool having end'iianges with inwardly projecting marginal bosses that the bosses and the material co-operate to prevent the fault known as edge fog, and this application is directed to the film spool which is thus used.

Referencewill now be made to the accompanying drawing in all figures of which the same reference characters designate the same parts and in which certam parts and dimensions are exaggerated for the sake of clearness': y l' Fig; 1 is a perspective view of a spool embodymg my invention;

Fig'.`2"is a section yof one endA of the spool havin the photographic vstrip material woun thereon;

Fig. 3 is a sectional view of one end of a $5 modified form of spool;

Fig. 4 is a sectional view of one end of another modified form of spool;

Fig. 5 is a sectional view of one end of one of my improved spools showing the re- 40 silient action of the flange which may exist when material is wound thereon.

My improved spool comprises a core whichmay beof any usual t e, such as a wooden core, as shown at 1 in igs. 3, 4, Aand 5, or a metallic core, as shown at 2 in Fig. 2. At each end of the core is fixed-by any of the customary methods end ilanges 3. When used with a wooden core the anges have inturned tubular portions 4 which surround the ends of the core. The annular flanges are rigid with these. When a metal spool is used a metal disk is taken and the central part is struckout as shown at 6 to form a hub portion, and the ends of the tubular Serial No. 498,932.

core 2 are attach-ed to the terminal disk by any preferred method at 7. The extreme edge 5 of the disk lies in the same plane with the portion 7 of the en'd disk. In the vcase of the flan e used with the wooden core, it preferably ies in the same plane with that portion of the flange which lies adjacent the core at 8. From the core the ilange is graduall inclined inwardly, as indicated at 9, reac ing a maximum at 10 and then inclining quite rapidly outwardly again to the extreme edge 5. There is thus formed at the margin an annular continuous abutment. If desired, the extreme edge may be only slightly turned back, as indicated in Fig. 3 at 11, or its final recurving may be omitted entirely, asin Fig. 4, where the maximum edge, as indicated at 12.

The co-action between the strip material and the flange is ilully explained in my copending application, and it is suilicient here to state that durin winding the protective point of inward bendingv is at the extreme material 13, which 1s wider than the distance between the facing abutments, is slightly distorted or bent as it passes between these abutments, and when wound upon the spool the compression of the strip material against the abutment holds it in rolled condition and constitutes a light lock at the ends of the roll', preventing the ingress of light to the edges of the inner convolutions in which lie the sensitized material 14.

As the flanges are made of sheet metal,

they .will usually have a certain small' amount of resilience and there will be a under t e pressure of the coiled material within, this being indicated in Fig. 5, where the dotted line indicates the normal position of the flange and the full line its position' unbroken light seal at all points of the cir'.`

tendencyl for them to be pressed outwardly ters Patent is:

cumference of the ends of the rolled material. v

While il have shown certain forms of my invention, it is obvious that numerous o ther embodiments are possible and l contemplate as included in in invention all such equivalents and inodi cations as fall within the scope ci the ap ended claims. Having thus escribed my invention, what l claim as new and desire to secure by Let- 1. A spool for photographic hlm coinprising a core with spaced circular Hanges, at least one of said anges being resllient and having at its margin and on its inner surface an inwardly projecting continuous ring.

2. A spool 'for photographic material coinprisiiig a core and end flanges rigid therewith, the dan es having on their facing surfaces inwar y projecting rings extending continuousl around their entire jmargins, said rings eing gradually inclined toward the core in directions away from one another.

3. A spool for-photographic film comprising a core and resilient end anges, the anges being inclined inwardly toward each other to forni inwardly projecting rings extending continuously around their entire margins.

4. A spool for photographic film comprising a core and circular end' iianges, the ilanges having on their facing surfaces inwardly projecting rings Vextending continuously around their entire margins, said rings being inclined in directions away from one |another hoth toward the core and toward the edges of the flanges, so that strip photographic material may be readily rolled upon and unrolled from said spool.

5. A spool for photographic film comprising a core and circular end flan es, the langes having on their facing sur aces inwardly projecting rings extending continuously around their entire margins, said rings being gradually inclined toward the core in directions away from one another, and heing more sharply inclined toward the edges of the flanges in directions away from one another. y

6. A spool for photo aphic iilm comprising a core and circu ar end flanges? the inner surfaces of the end flanges rom the core to points adjacent the edges oit the i'ianges inclining gradually and continuously toward each other to continuous rings of uniform maximum displacement from the planes of the central portions thereof, said rings extending around the margins ot the tlanges.

7. A. spool for photographic nlm comprising a core and circular end danges, the inner surfaces of the end flanges from the core to points adjacent the edges of the danges inclining gradually toward each other to rings of uniiorm maximum displacement from the planes of the central portions, and then recur'ving' to `jorrii rounded surfaces upon the outer sides of said rings.

8. A spool :for photographic lilm comprising a metal core and anges of resilient sheet metal rigidly attached to the ends of said core, and forming a light-tight'connec-l tion therewith, the flangesinclining gradually from said core to points adjacent the edges of the flanges to form continuous inwardly projecting rings and recurved toV form rounded surfaces upon the outer sides of said rings.

Signed at New York this 29th day of August, 1921.

EDN F. KINGSBURY. 

